Lock.



No. 840,873. PATENTBD JAN. 8, 1907.

W. E. SPARKS. LOCK.

APPLICATION FILED SEP'i'.-12, 1904.

2 SHEETS-SHEET 1.

PATENTED JAN. 8, 1907. W'. E. SPARKS. LOCK APP'LIOATION FILEDSEPT.12,1904.

2 SHEETS-SHEET-Z.

UNITED STATES PATENT OFFICE.

WILLIAM E. SPARKS, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO SARGENT &COMPANY, OF NEW HAVEN, CONNECTICUT, A CORPO- RATION OF CONNECTICUT.

LOCK.

No. 840,873. Specification of Letters Patent. Patented Jan. 8, 1907.'Application filed September 12, 1904. Ser al No. 224,109.

T 6W1 whom it y OOVbOWI/I wings D, adapted to engage lugs E on a slid- 5Be it known that I, WILLIAM E. SPARKS, of ing yoke F. The yoke F at-itsforward end the city and county of New Haven, State of has projectionsG, which engage depending Connecticut, have invented new and usefulstuds H on rear projections I of the latch- Irnprovements in Locks, ofwhich the followbolt K, whereby upon the rearward moveing is afull,clear, and exact description when ment of the yoke F under pressureexerted 6o taken in connection with the accompanying on the hub thelatch-bolt K will be retracted. drawings, which form a part thereof, andin On the other hand, the projections I of the which latch-bolt K areadapted to come in contact Figure 1 represents a front elevation of awith a flange or flanges L on the yoke, so that lock embodying myinvention; Fig. 2, a rear upon the retraction of the bolt K the yokeview of the same, the cap-plate having been will be forced rearwardalso. The latch-bolt removed; Figs. 3 and 4, similar views with is,however, capable of a slight movement inthe parts shown in differentpositions; Fig. 5, dependent of the yoke before the projections a detailrear view of the yoke; Figs. 6 and 7, I contact with the flanges L. rearand front detail views, respectively, of A spring M, connecting case Aand latch the latch; and Figs. 8 and 9, central longitubolt K, normallyretains the bolt in its prodinal sections through the latch on lines 8 8tracted position, and a spring N, connecting of Fig. 7, in Fig. 9 latchbeing shown in enthe case A and yoke F, normally holds the gagement withthe keeper. yoke in the same position. These parts may,

In all figures similarletters of reference j however, be of any suitableconstruction and represent like parts. are not, therefore, described indetail.

This invention relates to looks, and has for I The forward end of thelatch-bolt is proits object the production of a lock having a vided witha longitudinal recess O, in which novel form of safety-catch whichprevents is pivoted at Q a safety-catch P, having subthe bolt when inengagement with the keeper stantially the form of abell-crank lever. Onefrom being retracted by any external means end B of the safety-catch isconstructed to other than the lock itself. When in use on a conform withthe outer end or face of the bolt door, it will thus be impossible for asneak K, and the other end S is adapted to be enthief or other person toinsert an instrument gaged by a spring T, fitting in a socket U inbetween the keeper and the lock and retract the bolt, so that normallythe end B of the the latch. catch will fit in the groove or recess O andTo this end the invention consists in a conform to the outer end of thebolt K. safety-catch pivoted to the bolt, adapted to Pivoted on a post Von the case A is a engage the side of the keeper when the bolt islocking-dog W, the forward end or nose X of protracted and prevent theretraction of the which is adapted to project behind the part 0 boltexcept by means of the key, knob, or S of the safety-catch P whenthe'parts are at other legitimate means. rest, Figs. 2 and 4. A post Yon the yoke The invention further consists of novel engages a groove ornotch Z-in the dog W, s0 means for regulating the movement of the thatupon the retraction of the-yoke the post safety-catch, together withother improve- Y will tend to rotate the dog W, swinging the 9 5 mentsand combinations of parts set forth nose X from its position in the rearof the and claimed hereinafter. safety-catch P, as shown moreparticularly Referring to the drawings for a more parin Fig. 3. ticulardescription, the part designated by A thumb-piece A is shown in Fig. 1on the the letter A represents the lock-case open on outside of thecasing A, which is adapted, by 1 00 its reverse side, which opening isadapted to means of suitable mechan sm, (not shown,) be closed by acap-plate. (Not shown.) The to lock the latch-bolt K against retractioninvention is shown applied to arim-lock, but in a well-known manner whenthe thumbis adapted for use in any suitable form of piece is shifted toaproper position.

lock. The operation of the lock is as follows:

B designates the knob, and C the hub or When the parts are in theirnormal position, shank to which the knob is connected in any (shown inFig. 2,) the dog W engages the arm suitable manner. The hub C haslateral S of the safety-catch P, so that the bolt cannot be retractedunless the dog W is swung catch pivoted to the bolt; and a deviceadaptout of the path of the safety-catch, Fig. 3, ed to engage saidsafety-catch and rotate it or the safety-catch P is swung on its pivot,when the bolt is pushed in, and mechanism Fig. 8. The first of theseoperations takes operated by the bolt adapted to withdraw place when thebolt is retracted by means of said device from said engagement upon the70 the knob, for when the hub C of the knobrotation of said catch,substantially as deshank is rotated and retracts the yoke F, as scribed.

shown more particularly in Fig. 3, the 0st 3. In a lock, the combinationwith the Y on the yoke engages in the groove Z 0 the case; of a boltmovable in said case; a safetydog W and rotates the dog, so that thenose catch pivoted to the bolt; a device adapted 75 X is removed fromthe path of the arm S-of to engage said safety-catch and rotate it thesafety-catch P. The bolt may then be when the bolt is pushed/in, andmechanism retracted on the continued rearward movefor withdrawing saiddevice from such enment of the yoke by means of the engagement gagement,substantially as described.

I 5 between the projections G on the yoke and I 4:. In a lock, thecombination with the 80 depending studs H on the bolt. Upon the case; ofa bolt movable in said case; a safetyrelease of the knob the parts arerestored to catch pivoted to the bolt; a device adapted their normalposition and the bolt is proto engage said safety-catch and rotate ittracted by means of the spr n M or N. The when the bolt is pushed in andmechanism second of these operations ta es place when for withdrawingsaid device from such en- 85 the bolt is retracted by pressure on itsface, gagement upon the further rearward move- (as when the door isclosing and the face of ment of the bolt, substantially as described.the bolt strikes the keeper.) The lower arm 5. In a lock, thecombination with the S of the safety-catch P is engaged by the nose caseof a bolt movable in said case a safety- X of the checking-dog W, sothat rearward catch on the bolt; a device adapted to engage 9o movementof the bolt tends to swing the said safety-catch when the bolt is pushedin; safety-catch P on its pivot to substantially a retracting member forthe bolt; and mechthe position shown in Fig. 8, where the catc anism forwithdrawing'said device from such may swing upward into a suitable slotB in engagement only upon the rearward move- 0 the face-plate C of thecasing A. At this ment of said member, substantially as de- 5 point whenthe parts have assumed the posiscribed. tions shown in Fig. 4 theprojections I of the 6. In a lock, the combination with the bolt willstrike against the flange L onthe case; of a bolt movable in said case asafety yoke and force the yoke rearward; but this catch pivoted to thebolt a device adapted to 3 5 rearward movement of the yoke rotates theengage said safety-catch to rotate it when 100 dog W by means of thestud Y, so that the the bolt is pushed in; a retracting member nose X isgradually drawn out of the path of for the bolt adapted to withdraw saiddevice the arm S, whereupon the bolt may be forced from such engagementupon the rearward entirely back without being further checked movementof the bolt, substantially as de- 4 by the dog. Y scribed.

Under the conditions suggested above the 7. In a lock, the combinationwith the safety-catch will not check the latchbolt,' case; of a boltmovable in said case; safetybut when the bolt is shot home into thecatch pivoted to the bolt; a device adapted keeper (see Fig. 9) and anattem t is made to engage said safety-catch to rotate it when 4 5 toretract the bolt by operating out eproject- I the bolt is pushed'in;mechanism for Withno mg portion of the bolt the safetycatch drawing saiddevice from such engagement comes into play. The locking-dog W strikesoperated by the bolt, after the bolt is'paragainst the arm S of thesafety-catch P, and tially retracted, substantially as described. thelatter is not free to turn on'its Ipivot, ow- 8. In a lock, thecombination with the 5 ing to its engagement with the eeper, so 2 case;of a bolt movable in said case; a safety- I I5 that the bolt cannot beretracted. I catch pivoted to the bolt; a device adapted Having nowdescribed my invention, I to engage said safet -catch to rotate it whenwhich mayvary in its details without departthe bolt is pushed in; asliding member for ing from the spirit thereof, what I claim, andretracting the bolt, adapted to withdraw desire to secure by LettersPatent, is said device from such engagement, said slid- I20 1. In alock, the combination with the ing member being retracted by the boltupon case of a bolt movable in said case a safetyits continuedretraction after it has been parcatch pivoted to the bolt a deviceadapted tially pushed in, substantially as described. to engage saidsafety-catch and rotate it In witness whereof I have hereunto set myglen tdhe bolt is pililshed1 in and a keepler hand on the 29th day ofAugust, 1904.

a a te to enga e t e bo t an revent t e rota tion of said safetybatch;sd bstantially WILLIAM\E"SPARKS' as described. Witnesses:

2. In a lock, the combination with the I L. F. BREESE, case; of a boltmovable in said case; a safety- F. M. VALENTINE.

